<template>
  <div>
     <!-- 面包屑导航区域 -->
     <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告信息提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false">
      </el-alert>
      <!-- 步骤条 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                expand-trigger="hover"
                :options="catelist"
                :props="cateProps"
                v-model="addForm.goods_cat"
                @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
            <!-- 复选框组 -->
            <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action  表示图片要上传的后台api地址-->
            <!-- list-type="picture 图片预览方式 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headersObj"
              :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
                <div slot="tip" class="el-upload__tip">只能上传jpg/png文件且不超过500kb</div>
              </el-upload>
            </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card> 

    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from "lodash"
export default {
  name:'Add',
  data() {
    return {
      activeIndex: 0,
      // 添加商品表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat:[],
        // 图片的数组
        pics:[],
        // 商品详情
        goods_introduce: '',
        attrs: [],
      },
      // 添加商品表单数据验证规则
      addFormRules: {
        goods_name: [
          {required: true, message: '请输入商品名称',trigger: 'blur'}
        ],
        goods_price: [
          {required: true, message: '请输入商品价格',trigger: 'blur'}
        ],
        goods_weight: [
          {required: true, message: '请输入商品重量',trigger: 'blur'}
        ],
        goods_number: [
          {required: true, message: '请输入商品数量',trigger: 'blur'}
        ],
        goods_cat: [
        {required: true, message: '请选择商品分类',trigger: 'blur'}
        ]
      },
      // 商品分类列表
      catelist:[],
      // 商品分类列表
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children',
      },
      // 动态参数列表数组
      manyTableData: [],
      // 静态属性列表
      onlyTableData: [],
      // 上传图片URL地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headersObj: {
        Authorization:window.sessionStorage.getItem('token')
      },
      // 图片预览
      previewPath: '',
      // 图片预览预览对话框显示与隐藏
      previewVisible: false
    }
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data:res } = await this.$http.get('categories')

      if(res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      // console.log(res.data)
      // this.catelist = res.data
      // 把数据列表，赋值给catelist
      this.catelist = res.data
      console.log(this.catelist);
      // 为总数据条数赋值
      this.total = res.data
      // this.$message.success('获取商品分类成功')
    },
    // 级联选择器选中项变化，会触发这个函数
    handleChange() {
      console.log(this.addForm.goods_cat);
      if(this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave(activeName,oldActiveName) {
      // console.log('即将离开标签页是' + oldActiveName);
      // console.log('即将进入标签页是' + activeName);
      if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    async tabClicked() {
      // console.log(this.activeIndex);
      if(this.activeIndex === '1') {
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params:{sel:'many'}
        })
        if(res.meta.status !== 200) {
          return this.$message.error('获取动态参数失败')
        }
        // console.log(res.data);
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
        })
        this.manyTableData = JSON.parse(JSON.stringify(res.data))
      } else if (this.activeIndex === '2') {
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params:{sel:'only'}
        })
        if(res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败')
        }
        // 打印静态属性信息
        console.log(res.data);
        this.onlyTableData = JSON.parse(JSON.stringify(res.data))
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      const u = 'http://127.0.0.1:8888/'
      this.previewPath = u + file.response.data.tmp_path
      this.previewVisible = true
    },
    // 处理移除图片函数
    handleRemove(file) {
      console.log(file);
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics 数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => 
        x.pic === filePath
      )
      // 3.调用数组中splics方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i,1)
      console.log(this.addForm);
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      // console.log(response);
      // 1.拼接得到一个图片信息的对象
      const picInfo = {pic: response.data.tmp_path}
      // 2.将图片信息对象， push到pics数组中
      this.addForm.pics.push(picInfo)
      // console.log(this.addForm);
    },
    // 添加商品
    add() {
      console.log(this.addForm);
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        // 执行添加业务逻辑
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')

        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals 
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form);

        // 发起请求添加商品
        const {data:res} = await this.$http.post('goods',form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败！')
        }

        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId() {
      if(this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
    return null
    }
  }
}
</script>

<style lang="less" scoped>
  .el-checkbox {
    margin: 0 10px !important;
  }
  .previewImg {
    width: 100%;
  }
  .btnAdd {
    margin-top: 18px;
    float: right;
  }
</style>